Some folks have had very bad reactions to Activia since it puts a bacteria into the stomach that normally isn't there and it's hard to get rid of afterwards. I personally won't touch the stuff, but eat regular plain yogurt every day instead.
Here's just one of many forums where people are discussing problems with Activia.http://forums.bettermedicine.com/showth ... via-yogurt
Bifidus regularis is scientifically known as Bifidobacterium animalis. It is normally found in the large intestine and not in the stomach.http://whatisbifidusregularis.org/http://www.probiotic.org/bifidobacterium-animalis.htmhttp://ca.answers.yahoo.com/question/in ... 942AAFuuLe